close() was never explicitly called on database '/data/data/com.example.shiyan/databases/njupt.db'

本文主要介绍了在进行数据库操作后,正确关闭游标和数据库连接的重要性。若未正确关闭,可能会导致资源泄露等问题。文章强调了在完成所有数据库操作后务必调用db.close()来释放资源。

意思是指在此处打开数据库操作之前,应用程序没有关闭游标或数据库对象。

在应用中,对数据库操作完成后,应该对游标及数据库进行关闭操作

即:这主要是没用调用db.close()所导致的....


可以参考一下一下的文章:http://blog.youkuaiyun.com/geekpark/article/details/9469175

### GLVND EGL Vendor Configuration in `/usr/share/glvnd/egl_vendor.d` Compatibility and Setup Issues The configuration files within the directory `/usr/share/glvnd/egl_vendor.d` are crucial for managing multiple GPU drivers on a single system, ensuring that applications can correctly select which driver to use based on their requirements. These configurations help resolve conflicts between different OpenGL implementations provided by various vendors such as NVIDIA or Mesa. For systems using NVIDIA GPUs with specific versions of CUDA like 9.0 mentioned previously[^3], it is important to ensure proper setup of these directories so that both the correct version of the NVIDIA driver and compatible libraries (such as those from Anaconda environments) work seamlessly together without causing any compatibility issues. When dealing with potential problems related to this path: - Ensure all necessary environment variables (`LD_LIBRARY_PATH`, `PATH`) point to appropriate locations where required library files reside. For instance, if working inside an Anaconda virtual environment named `nerf39-201`, one should verify whether paths similar to `/home/gpu/anaconda3/envs/nerf39-201/lib` appear in `$LD_LIBRARY_PATH`. This ensures access to expected versions of shared objects including libstdc++ matching desired ABI levels indicated through commands like `strings ...libstdc++.so.6 | grep GLIBCXX_[version]`. - Verify symbolic links under `/etc/alternatives` pointing towards intended binaries/drivers rather than alternatives installed via package managers unless explicitly preferred otherwise. - Confirm presence and correctness of `.json` files inside `/usr/share/glvnd/egl_vendor.d`; they define how each vendor's implementation interacts during runtime initialization processes involving EGL interfaces. To check current settings effectively: ```bash ls -l /usr/share/glvnd/egl_vendor.d/ cat /usr/share/glvnd/egl_vendor.d/*.json ``` Additionally, inspecting logs generated while running affected programs might provide clues regarding mismatches encountered at load time due to improper linkage against mismatched symbol tables across diverse software stacks involved here.
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